經濟學題目翻譯及解答~感激不盡

Which of the following for statements is(are) correct? (1) If a demand curve is upward-sloping,then it is a normal good (2) If a demand curve is upward-sloping,then it may not be an inferior good (3) If a demand curve is upward-sloping,then an increase in the consumer's income will shift the demand curve... show more Which of the following for statements is(are) correct?
(1) If a demand curve is upward-sloping,then it is a normal good

(2) If a demand curve is upward-sloping,then it may not be an inferior good

(3) If a demand curve is upward-sloping,then an increase in the consumer's
income will shift the demand curve rightward

(4) If demand curve is upward-sloping,then an increase in the price of the
substitute of the considering goods will shift the demand curve rightward
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